Wood-boring implement.



PATENTED DEC. 26, 1905,

J LUND WOOD BORING IMPLEMENT.

APPLICATION FILED FEB 7 1905 I| 5 2 .171? my.

Winesses to improve their performance in use.

UNITE JOEL LUND, OF SAN FRANCISCO, CALIFORNIA.

WOOD-BORING IMPLEMENT.

Specification of Letters latent.

Patented Dec. 26, 1905.

Application filed February 7, 1905. Serial No. 244,603.

To aZZ whom it may concern.-

Be it known that I, JOEL LUND, a citizen of the United States of America, residing at San Francisco, county of San Francisco, and State of California, have invented certain new and useful Improvements in VVood-Boring Implements; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification.

This invention relates to boring implements for wood, commonly called angers or augenbits, and to certain improvements therein, as hereinafter described, and illustrated by drawings forming a part of this specification.

Said improvements consist in constructing the helical web of such implements flanged in cross-section to provide for lips or advanced cutting-spurs continuous along the web either for some distance or for the whole distance of the helix, so that when the spurs are worn or broken new spurs can be formed by filing back the transverse edges of the flange and central section. In conjunction with the above I also provide detachable and interchangeable screw-points of different helical pitch, so that the augers or bits so provided can be adapted to advance at different rates of speed into the wood, accordingly as the latter is hard or soft and as the smoothness and quality of the work demands, said detachable points being insertible in proper position as the cutting edges recede.

The objects of my invention are to increase the durability of such implements and To this end I provide the construction shown in the drawings, wherein Figure I is a side view of an auger-bit made according to my invention. Fig. II is 'a cross-section on line as a: of Fig. I. Figs. III,

IV, and V are side views of points adapted to be detachably used in the auger-bit shown in Fig. I.

In common practice the life or time of use for angers and auger-bits depends on the maintenance of the spur edges that sever the wood parallel to or around the periphery of the holes bored. The displacing or excavating edges transverse to the axis of the implements last indefinitely because reproduced from the section of the bit. This same method is by my invention applied to the spurs.

Referring to the drawings, the helix of the auger 1 and stem 2 are in so far as appearance and functions are concerned the same as a common implement of the kind; but the helical part or web is flanged, as shown in section in Fig. II, the edge being of a form to provide for the spurs 3 and 4 for a part of or for the whole length of helix 1, as shown in Fig. I. When these spurs become too short by wear, the transverse edges 5 and 6 are filed back to produce new spurs 3 and 4 by simply leaving the flanged portion unfiled the same being of the proper width for new spurs. To

rovide for the centering or screw point after filing, it is made detachable and at the center there is an expanded or reinforced portion 7, drilled to a considerable depth and screwthreaded to receive the screw-points. The screw-threaded socket of the part 7 isdrilled and screw-threaded to a considerable distance beyond the part occupied by the shank of the screw-point to provide for its reinsertion in the proper place as the cutting edges are worn away.

Then the auger-bits are used in machines, they are advanced without the aid of a screwpoint, and a polygonal point is most suitable. For hard wood and careful boring the point 9 with a fine thread is suitable, and for rapid boring in soft wood a point 10 with a coarse thread and pitch is suitable.

Having thus explained the nature and objects of my invention, what I claim, and desire to secure by Letters Patent, is

1. An auger having a helical web provided with flanges for a portion of its length at the edges of the web of such cross-section as to form new spurs when the chip-raising or tion of the web merely is filed back to orm new cutting edges, substantially as specified.

2. In an auger having a helical web flanged at its edges to form material. -for new spurs I In testimony whereof I have signed my as the chip-raising portion 1s hled back to name to tlns specincatlon 1n the presence of furnlsh new cutting edges, a central re1ntWo subscrlbnig Witnesses.

forced portion deeply socketed and screw- JOEL LUND. 5 threaded to receive detachable screw-points \Vitnesses:

in a new position after the new cutting edges HENRY H. BATES,

are completed, substantially as specified. EDWIN S. OLARKsoN. 

